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/*
Authors:
Pavel Březina <pbrezina@redhat.com>
Jakub Hrozek <jhrozek@redhat.com>
Copyright (C) 2011 Red Hat
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <talloc.h>
#include <tevent.h>
#include <dbus/dbus.h>
#include "sbus/sssd_dbus.h"
#include "util/util.h"
#include "sbus/sbus_client.h"
#include "providers/data_provider.h"
#include "responder/common/responder.h"
#include "responder/sudo/sudosrv_private.h"
struct sudo_dp_refresh_state {
dbus_uint16_t err_maj;
dbus_uint32_t err_min;
};
/* FIXME -- need to keep track of a running request
* and just queue a callback
* OR reuse the common dp requests
*/
static void sudosrv_dp_process_reply(DBusPendingCall *pending, void *ptr);
struct tevent_req * sudosrv_dp_refresh_send(struct resp_ctx *rctx,
struct sss_domain_info *dom,
const char *username)
{
struct be_conn *be_conn;
struct sudo_dp_refresh_state *state;
DBusMessage *msg;
dbus_bool_t dbret;
int ret;
const int timeout = SSS_CLI_SOCKET_TIMEOUT / 2;
struct tevent_req *req;
/* Cache refresh requests need to be allocated on the responder context
* so that they don't go away if a client disconnects. The worst-
* case scenario here is that the cache is updated without any
* client expecting a response.
*/
req = tevent_req_create(rctx, &state, struct sudo_dp_refresh_state);
if (!req) return NULL;
/* double check dp_ctx has actually been initialized.
* in some pathological cases it may happen that sudo starts up before
* dp connection code is actually able to establish a connection.
*/
ret = sss_dp_get_domain_conn(rctx, dom->name, &be_conn);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE,
("The Data Provider connection for %s is not available! "
"This maybe a bug, it shouldn't happen!\n",
dom->name));
ret = EIO;
goto error;
}
msg = dbus_message_new_method_call(NULL,
DP_PATH,
DP_INTERFACE,
DP_METHOD_SUDOHANDLER);
if (msg == NULL) {
DEBUG(SSSDBG_FATAL_FAILURE, ("Out of memory?!\n"));
ret = ENOMEM;
goto error;
}
if (username != NULL) {
dbret = dbus_message_append_args(msg,
DBUS_TYPE_STRING, &username,
DBUS_TYPE_INVALID);
if (!dbret) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Failed to generate dbus reply\n"));
ret = EIO;
goto error;
}
}
DEBUG(SSSDBG_TRACE_FUNC, ("Sending SUDOers refresh request\n"));
ret = sbus_conn_send(be_conn->conn, msg,
timeout, sudosrv_dp_process_reply,
req, NULL);
dbus_message_unref(msg);
return req;
error:
tevent_req_error(req, ret);
tevent_req_post(req, rctx->ev);
dbus_message_unref(msg);
return req;
}
static int sudosrv_dp_get_reply(DBusPendingCall *pending,
dbus_uint16_t *err_maj,
dbus_uint32_t *err_min,
char **err_msg)
{
DBusMessage *reply;
DBusError dbus_error;
dbus_bool_t ret;
int type;
int err = EOK;
dbus_error_init(&dbus_error);
reply = dbus_pending_call_steal_reply(pending);
if (!reply) {
/* reply should never be null. This function shouldn't be called
* until reply is valid or timeout has occurred. If reply is NULL
* here, something is seriously wrong and we should bail out.
*/
DEBUG(0, ("Severe error. A reply callback was called but no reply was received and no timeout occurred\n"));
err = EIO;
goto done;
}
type = dbus_message_get_type(reply);
switch (type) {
case DBUS_MESSAGE_TYPE_METHOD_RETURN:
ret = dbus_message_get_args(reply, &dbus_error,
DBUS_TYPE_UINT16, err_maj,
DBUS_TYPE_UINT32, err_min,
DBUS_TYPE_STRING, err_msg,
DBUS_TYPE_INVALID);
if (!ret) {
DEBUG(1,("Failed to parse message\n"));
if (dbus_error_is_set(&dbus_error)) dbus_error_free(&dbus_error);
err = EIO;
goto done;
}
DEBUG(4, ("Got reply (%u, %u, %s) from Data Provider\n",
(unsigned int)*err_maj, (unsigned int)*err_min, *err_msg));
break;
case DBUS_MESSAGE_TYPE_ERROR:
if (strcmp(dbus_message_get_error_name(reply),
DBUS_ERROR_NO_REPLY) == 0) {
err = ETIME;
goto done;
}
DEBUG(0,("The Data Provider returned an error [%s]\n",
dbus_message_get_error_name(reply)));
/* Falling through to default intentionally*/
default:
/*
* Timeout or other error occurred or something
* unexpected happened.
* It doesn't matter which, because either way we
* know that this connection isn't trustworthy.
* We'll destroy it now.
*/
err = EIO;
}
done:
dbus_pending_call_unref(pending);
dbus_message_unref(reply);
return err;
}
static void sudosrv_dp_process_reply(DBusPendingCall *pending, void *ptr)
{
struct tevent_req *req;
errno_t ret;
char *err_msg;
struct sudo_dp_refresh_state *state;
req = talloc_get_type(ptr, struct tevent_req);
state = tevent_req_data(req, struct sudo_dp_refresh_state);
ret = sudosrv_dp_get_reply(pending, &state->err_maj, &state->err_min, &err_msg);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Failed to get a reply from DP! "
"err_maj: %d err_min: %d err_msg: [%s]\n",
state->err_maj, state->err_min, err_msg ? err_msg : "none set"));
tevent_req_error(req, EIO);
return;
}
tevent_req_done(req);
}
errno_t sudosrv_dp_refresh_recv(struct tevent_req *req,
dbus_uint16_t *_err_maj,
dbus_uint32_t *_err_min)
{
struct sudo_dp_refresh_state *state;
state = tevent_req_data(req, struct sudo_dp_refresh_state);
if (_err_maj) *_err_maj = state->err_maj;
if (_err_min) *_err_min = state->err_min;
TEVENT_REQ_RETURN_ON_ERROR(req);
return EOK;
}
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